1 // SPDX-License-Identifier: GPL-2.0-only
3 * i2c-ali1563.c - i2c driver for the ALi 1563 Southbridge
5 * Copyright (C) 2004 Patrick Mochel
8 * The 1563 southbridge is deceptively similar to the 1533, with a
9 * few notable exceptions. One of those happens to be the fact they
10 * upgraded the i2c core to be 2.0 compliant, and happens to be almost
11 * identical to the i2c controller found in the Intel 801 south
14 * This driver is based on a mix of the 15x3, 1535, and i801 drivers,
15 * with a little help from the ALi 1563 spec.
18 #include <linux/module.h>
19 #include <linux/delay.h>
20 #include <linux/i2c.h>
21 #include <linux/pci.h>
22 #include <linux/acpi.h>
24 #define ALI1563_MAX_TIMEOUT 500
25 #define ALI1563_SMBBA 0x80
26 #define ALI1563_SMB_IOEN 1
27 #define ALI1563_SMB_HOSTEN 2
28 #define ALI1563_SMB_IOSIZE 16
30 #define SMB_HST_STS (ali1563_smba + 0)
31 #define SMB_HST_CNTL1 (ali1563_smba + 1)
32 #define SMB_HST_CNTL2 (ali1563_smba + 2)
33 #define SMB_HST_CMD (ali1563_smba + 3)
34 #define SMB_HST_ADD (ali1563_smba + 4)
35 #define SMB_HST_DAT0 (ali1563_smba + 5)
36 #define SMB_HST_DAT1 (ali1563_smba + 6)
37 #define SMB_BLK_DAT (ali1563_smba + 7)
39 #define HST_STS_BUSY 0x01
40 #define HST_STS_INTR 0x02
41 #define HST_STS_DEVERR 0x04
42 #define HST_STS_BUSERR 0x08
43 #define HST_STS_FAIL 0x10
44 #define HST_STS_DONE 0x80
45 #define HST_STS_BAD 0x1c
48 #define HST_CNTL1_TIMEOUT 0x80
49 #define HST_CNTL1_LAST 0x40
51 #define HST_CNTL2_KILL 0x04
52 #define HST_CNTL2_START 0x40
53 #define HST_CNTL2_QUICK 0x00
54 #define HST_CNTL2_BYTE 0x01
55 #define HST_CNTL2_BYTE_DATA 0x02
56 #define HST_CNTL2_WORD_DATA 0x03
57 #define HST_CNTL2_BLOCK 0x05
60 #define HST_CNTL2_SIZEMASK 0x38
62 static struct pci_driver ali1563_pci_driver;
63 static unsigned short ali1563_smba;
65 static int ali1563_transaction(struct i2c_adapter *a, int size)
71 dev_dbg(&a->dev, "Transaction (pre): STS=%02x, CNTL1=%02x, "
72 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
73 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
74 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
77 data = inb_p(SMB_HST_STS);
78 if (data & HST_STS_BAD) {
79 dev_err(&a->dev, "ali1563: Trying to reset busy device\n");
80 outb_p(data | HST_STS_BAD, SMB_HST_STS);
81 data = inb_p(SMB_HST_STS);
82 if (data & HST_STS_BAD)
85 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
87 timeout = ALI1563_MAX_TIMEOUT;
90 } while (((data = inb_p(SMB_HST_STS)) & HST_STS_BUSY) && --timeout);
92 dev_dbg(&a->dev, "Transaction (post): STS=%02x, CNTL1=%02x, "
93 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
94 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
95 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
98 if (timeout && !(data & HST_STS_BAD))
102 dev_err(&a->dev, "Timeout - Trying to KILL transaction!\n");
103 /* Issue 'kill' to host controller */
104 outb_p(HST_CNTL2_KILL, SMB_HST_CNTL2);
105 data = inb_p(SMB_HST_STS);
109 /* device error - no response, ignore the autodetection case */
110 if (data & HST_STS_DEVERR) {
111 if (size != HST_CNTL2_QUICK)
112 dev_err(&a->dev, "Device error!\n");
116 if (data & HST_STS_BUSERR) {
117 dev_err(&a->dev, "Bus collision!\n");
118 /* Issue timeout, hoping it helps */
119 outb_p(HST_CNTL1_TIMEOUT, SMB_HST_CNTL1);
122 if (data & HST_STS_FAIL) {
123 dev_err(&a->dev, "Cleaning fail after KILL!\n");
124 outb_p(0x0, SMB_HST_CNTL2);
130 static int ali1563_block_start(struct i2c_adapter *a)
136 dev_dbg(&a->dev, "Block (pre): STS=%02x, CNTL1=%02x, "
137 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
138 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
139 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
140 inb_p(SMB_HST_DAT1));
142 data = inb_p(SMB_HST_STS);
143 if (data & HST_STS_BAD) {
144 dev_warn(&a->dev, "ali1563: Trying to reset busy device\n");
145 outb_p(data | HST_STS_BAD, SMB_HST_STS);
146 data = inb_p(SMB_HST_STS);
147 if (data & HST_STS_BAD)
151 /* Clear byte-ready bit */
152 outb_p(data | HST_STS_DONE, SMB_HST_STS);
154 /* Start transaction and wait for byte-ready bit to be set */
155 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_START, SMB_HST_CNTL2);
157 timeout = ALI1563_MAX_TIMEOUT;
160 } while (!((data = inb_p(SMB_HST_STS)) & HST_STS_DONE) && --timeout);
162 dev_dbg(&a->dev, "Block (post): STS=%02x, CNTL1=%02x, "
163 "CNTL2=%02x, CMD=%02x, ADD=%02x, DAT0=%02x, DAT1=%02x\n",
164 inb_p(SMB_HST_STS), inb_p(SMB_HST_CNTL1), inb_p(SMB_HST_CNTL2),
165 inb_p(SMB_HST_CMD), inb_p(SMB_HST_ADD), inb_p(SMB_HST_DAT0),
166 inb_p(SMB_HST_DAT1));
168 if (timeout && !(data & HST_STS_BAD))
174 if (data & HST_STS_DEVERR)
177 dev_err(&a->dev, "SMBus Error: %s%s%s%s%s\n",
178 timeout ? "" : "Timeout ",
179 data & HST_STS_FAIL ? "Transaction Failed " : "",
180 data & HST_STS_BUSERR ? "No response or Bus Collision " : "",
181 data & HST_STS_DEVERR ? "Device Error " : "",
182 !(data & HST_STS_DONE) ? "Transaction Never Finished " : "");
186 static int ali1563_block(struct i2c_adapter *a,
187 union i2c_smbus_data *data, u8 rw)
192 /* Do we need this? */
193 outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);
195 if (rw == I2C_SMBUS_WRITE) {
196 len = data->block[0];
201 outb_p(len, SMB_HST_DAT0);
202 outb_p(data->block[1], SMB_BLK_DAT);
206 outb_p(inb_p(SMB_HST_CNTL2) | HST_CNTL2_BLOCK, SMB_HST_CNTL2);
208 for (i = 0; i < len; i++) {
209 if (rw == I2C_SMBUS_WRITE) {
210 outb_p(data->block[i + 1], SMB_BLK_DAT);
211 error = ali1563_block_start(a);
215 error = ali1563_block_start(a);
219 len = inb_p(SMB_HST_DAT0);
225 data->block[i+1] = inb_p(SMB_BLK_DAT);
228 /* Do we need this? */
229 outb_p(HST_CNTL1_LAST, SMB_HST_CNTL1);
233 static s32 ali1563_access(struct i2c_adapter *a, u16 addr,
234 unsigned short flags, char rw, u8 cmd,
235 int size, union i2c_smbus_data *data)
241 for (timeout = ALI1563_MAX_TIMEOUT; timeout; timeout--) {
242 reg = inb_p(SMB_HST_STS);
243 if (!(reg & HST_STS_BUSY))
247 dev_warn(&a->dev, "SMBus not idle. HST_STS = %02x\n", reg);
248 outb_p(0xff, SMB_HST_STS);
250 /* Map the size to what the chip understands */
252 case I2C_SMBUS_QUICK:
253 size = HST_CNTL2_QUICK;
256 size = HST_CNTL2_BYTE;
258 case I2C_SMBUS_BYTE_DATA:
259 size = HST_CNTL2_BYTE_DATA;
261 case I2C_SMBUS_WORD_DATA:
262 size = HST_CNTL2_WORD_DATA;
264 case I2C_SMBUS_BLOCK_DATA:
265 size = HST_CNTL2_BLOCK;
268 dev_warn(&a->dev, "Unsupported transaction %d\n", size);
273 outb_p(((addr & 0x7f) << 1) | (rw & 0x01), SMB_HST_ADD);
274 outb_p((inb_p(SMB_HST_CNTL2) & ~HST_CNTL2_SIZEMASK) |
275 (size << 3), SMB_HST_CNTL2);
277 /* Write the command register */
281 if (rw == I2C_SMBUS_WRITE)
282 /* Beware it uses DAT0 register and not CMD! */
283 outb_p(cmd, SMB_HST_DAT0);
285 case HST_CNTL2_BYTE_DATA:
286 outb_p(cmd, SMB_HST_CMD);
287 if (rw == I2C_SMBUS_WRITE)
288 outb_p(data->byte, SMB_HST_DAT0);
290 case HST_CNTL2_WORD_DATA:
291 outb_p(cmd, SMB_HST_CMD);
292 if (rw == I2C_SMBUS_WRITE) {
293 outb_p(data->word & 0xff, SMB_HST_DAT0);
294 outb_p((data->word & 0xff00) >> 8, SMB_HST_DAT1);
297 case HST_CNTL2_BLOCK:
298 outb_p(cmd, SMB_HST_CMD);
299 error = ali1563_block(a, data, rw);
303 error = ali1563_transaction(a, size);
307 if ((rw == I2C_SMBUS_WRITE) || (size == HST_CNTL2_QUICK))
311 case HST_CNTL2_BYTE: /* Result put in SMBHSTDAT0 */
312 data->byte = inb_p(SMB_HST_DAT0);
314 case HST_CNTL2_BYTE_DATA:
315 data->byte = inb_p(SMB_HST_DAT0);
317 case HST_CNTL2_WORD_DATA:
318 data->word = inb_p(SMB_HST_DAT0) + (inb_p(SMB_HST_DAT1) << 8);
325 static u32 ali1563_func(struct i2c_adapter *a)
327 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
328 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
329 I2C_FUNC_SMBUS_BLOCK_DATA;
333 static int ali1563_setup(struct pci_dev *dev)
337 pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
339 /* SMB I/O Base in high 12 bits and must be aligned with the
340 * size of the I/O space. */
341 ali1563_smba = ctrl & ~(ALI1563_SMB_IOSIZE - 1);
343 dev_warn(&dev->dev, "ali1563_smba Uninitialized\n");
347 /* Check if device is enabled */
348 if (!(ctrl & ALI1563_SMB_HOSTEN)) {
349 dev_warn(&dev->dev, "Host Controller not enabled\n");
352 if (!(ctrl & ALI1563_SMB_IOEN)) {
353 dev_warn(&dev->dev, "I/O space not enabled, trying manually\n");
354 pci_write_config_word(dev, ALI1563_SMBBA,
355 ctrl | ALI1563_SMB_IOEN);
356 pci_read_config_word(dev, ALI1563_SMBBA, &ctrl);
357 if (!(ctrl & ALI1563_SMB_IOEN)) {
359 "I/O space still not enabled, giving up\n");
364 if (acpi_check_region(ali1563_smba, ALI1563_SMB_IOSIZE,
365 ali1563_pci_driver.name))
368 if (!request_region(ali1563_smba, ALI1563_SMB_IOSIZE,
369 ali1563_pci_driver.name)) {
370 dev_err(&dev->dev, "Could not allocate I/O space at 0x%04x\n",
374 dev_info(&dev->dev, "Found ALi1563 SMBus at 0x%04x\n", ali1563_smba);
381 static void ali1563_shutdown(struct pci_dev *dev)
383 release_region(ali1563_smba, ALI1563_SMB_IOSIZE);
386 static const struct i2c_algorithm ali1563_algorithm = {
387 .smbus_xfer = ali1563_access,
388 .functionality = ali1563_func,
391 static struct i2c_adapter ali1563_adapter = {
392 .owner = THIS_MODULE,
393 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
394 .algo = &ali1563_algorithm,
397 static int ali1563_probe(struct pci_dev *dev,
398 const struct pci_device_id *id_table)
402 error = ali1563_setup(dev);
405 ali1563_adapter.dev.parent = &dev->dev;
406 snprintf(ali1563_adapter.name, sizeof(ali1563_adapter.name),
407 "SMBus ALi 1563 Adapter @ %04x", ali1563_smba);
408 error = i2c_add_adapter(&ali1563_adapter);
414 ali1563_shutdown(dev);
416 dev_warn(&dev->dev, "ALi1563 SMBus probe failed (%d)\n", error);
420 static void ali1563_remove(struct pci_dev *dev)
422 i2c_del_adapter(&ali1563_adapter);
423 ali1563_shutdown(dev);
426 static const struct pci_device_id ali1563_id_table[] = {
427 { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M1563) },
431 MODULE_DEVICE_TABLE(pci, ali1563_id_table);
433 static struct pci_driver ali1563_pci_driver = {
434 .name = "ali1563_smbus",
435 .id_table = ali1563_id_table,
436 .probe = ali1563_probe,
437 .remove = ali1563_remove,
440 module_pci_driver(ali1563_pci_driver);
442 MODULE_LICENSE("GPL");